Advantages and disadvantages of solar energy: Advantages: Universality, safety, abundance and sustainability.
Disadvantages: dispersion, instability, low efficiency and high cost.
Ways to develop solar energy: photothermal conversion/photoelectric conversion/photochemical conversion.
What are the characteristics of solar energy?
Advantages and disadvantages of solar water heaters
Advantages and disadvantages of solar water heaters There are many types of water heaters. Among them, solar water heaters are well known. We. Generally speaking, when buying a product, we first look at the brand, famous brands are reliable in terms of quality to a certain extent. The following details the advantages and disadvantages of solar water heaters.
Advantages and disadvantages of solar water heaters 11. Advantages of solar water heaters
1. Energy saving, environmental protection and money saving
< p>Energy saving, environmental protection and money saving < p> Solar energy is green, renewable and clean energy. Solar water heaters not only save energy and money, they actually do it. does not cause pollution to the environment. Solar water heaters also have wastewater purification functions, and the water source is clean and non-polluting; that's why solar energy is so popular among consumers2. Good temperature stability < /p>
The system has good temperature performance thermal insulation. As long as there is hot water in the water tank, there will be no heating then cooling phenomenon. In addition, the insulated water tank of the solar water heater has a water storage function, which can meet the intended use.hot water supply by a large number of people, and can also be used as an emergency water source when the water is cut off.
3. Safe and reliable, long life
Safe and reliable, long life
Solar energy The water heating system operates fully automatically and statically, without special supervision, without noise, without pollution, without dangers such as leakage, fire, poisoning, etc. It is safe and reliable. Solar water heaters have a long lifespan and can last up to 15 years if used correctly.
2. Disadvantages of solar water heaters
1. Complex installation
Location installation of solar water heaters The requirements are very strict. If it is installed incorrectly, it will not only cause safety hazards, but also affect the appearance. In addition, solar water heaters aregenerally installed on the roof of buildings, which makes their daily maintenance tedious.
2. Very dependent on sunlight
Very dependent on sunlight
Solar water heaters are very dependent on sunlight and require one day of sunlight to function. The water is heated by the sun. In good weather, hot water can only be guaranteed at night. Hot water is rarely available during the day and night. .Yes, comfort is poor.
Advantages and Disadvantages of Solar Water Heaters 2What are the advantages of an all-in-one solar electric water heater?
1. One-piece installation is simple, but it is not suitable for high-rise buildings. The split type is suitable for high-rise buildings, but installation requires drilling holes in the wall or even working at high altitude.
2. Compared to the Machine integrated with vacuum tube, the thermal efficiency of flat plate (split) solar water heater is very low. The same lighting, the same water tank, the temperature difference between the two can be 20-25℃.
3. Flat water tanks are generally located indoors and occupy part of the interior space, but their thermal insulation performance is better than that of vacuum tubes. The water tank of the vacuum tube all-in-one machine is outside, which quickly dissipates heat but does not occupy interior space.
4. There is no need to worry about the pipe bursting because there is no water in the flow channel. Vacuum tubes can burst and cause injury to people.
5. The shell of the flat screen is solid and the lighting surface is made of tempered glass, which is very solid. The vacuum tube type heating surface is made of ordinary glass, which has low resistance.ance and breaks easily.
6. The cost of vacuum tubes is much lower than that of flat panel displays.
7. Flat plate type is a pressurized water tank. Without water pressure, hot water cannot come out. The vacuum tube is pressure type and can produce hot water whether there is water pressure or not.
What are the advantages and disadvantages of solar water heaters?
1. Advantages: solar water heaters have no noise, no pollution, no poisoning and other dangers, reliable installation, low carbon content and Environmental Protection ; solar energy itself has high-tech processing technology, good heat transfer performance and high hot water production. It is large and suitable for use by several people in the family; during the cold winter, the solar water heater has strong resistancein frost and in summer, large-area solar water heaters can also insulate floors.
2. Disadvantages: The solar water heater is large in size, inconvenient to install, and has certain restrictions on installation conditions due to its large size and complex objects, maintenance is more difficult and must be repaired by; professionals; solar energy is harmful to the sun. It is relatively dependent on light resources if areas with cloudier and rainier days are not suitable for solar energy.
3. Solar water heaters are in theory a one-time investment and cost nothing to use. It's actually impossible. The reason is that no matter where you are, there are clouds, rain, snow and insufficient sunshine in winter every year. In this climate, hot water is mainly heated by electricity (some products are heatedgas fairies). On average, more than 25-50% of hot water needs to be heated entirely with electricity each year (this varies by region and region). there are many cloudy days). Actual electricity consumption in the region is even higher.
Advantages of solar energy
For new solar energy, this is the case. is different from fossil energy sources such as oil, coal and natural gas. Compared with nuclear energy, it has obvious characteristics
1? source of energy that humans can use. According to the theory of stellar evolution, the sun is The current energy radiated can last for nearly 10 billion years. Experts deduce that over the past billion years, the sun has only consumed 2% of its own energy, so this will not change significantly over the next billion years. We can therefore say that the sun can be used topermanently. Energy is inexhaustible and inexhaustible. The energy it sends to the ground for 15 minutes is enough for the entire world to use for a year. The energy from solar radiation that reaches the Earth's surface each year is approximately equivalent to 130 trillion tons of standard coal. Its total quantity is the largest. the energy that can be developed in the world today. For example, if we compare the different energy sources currently used each year by humans around the world to the energy emitted during the explosion of a grenade, then the energy of solar radiation that reaches the surface of the earth each year and can be used by humans is equivalent. to a hydrogen bomb. The amount of energy released during the explosion varies considerably.
2? Clean and pollution-free
The development and use of solar energy will not pollute the environmentment. When solar energy is used, it will not emit any substances that have a negative effect. environmental impact. It is the cleanest source of energy, in today's world where environmental pollution is becoming more and more serious, it is extremely valuable and has an incomparable advantage over any other source of energy. 'energy.
3? Widely distributed
The sun shines on the earth, no matter the land or the sea, no matter the mountains or the islands, there is bright sunshine and it does not require transportation and is easy to obtain. Areas between 50 and 60 degrees north and south latitude, with annual daylight hours of 1,600 to 2,400 hours, are generally thought to be rich in solar energy that can be used provided that an initial investment is made. made to build solar energy. device of use, the energy will continue to flow on its own. Delivered to your dooryou.
1? Low intensity
Although the solar energy reaching the upper limit of the earth's atmosphere and reaching the earth's surface is very huge, its intensity is not high. This energy is too scattered. A disadvantage is that as an energy source, its density is too low. On average, near the Tropic of Cancer, when the weather is relatively clear in summer, the irradiance of solar radiation is greatest at noon, and the solar energy received on an area of 1 square meter perpendicular to the direction of sunlight is only about 1,000 watts on average if the day and night average throughout the year is only about 200 watts. In winter it only reaches half, and in cloudy weather it is only about a fifth. This energy flow density is very low. Therefore, when using solar energy, if one wishes to obtain a certain conversion power, one often needs'a set of collection and conversion equipment of a considerable area, which is expensive.
2? Discontinuity
The greatest weakness of solar energy is its discontinuity. The alternation of day and night causes interruptions in solar radiation. On average, across most of the planet, almost half of the year is plunged into darkness; the other half depends on weather conditions. It is already very difficult to use solar energy on cloudy and rainy days, but it is impossible to use solar energy at night, which seriously limits the application of solar energy.
3? Uncertain
Due to the limitations of natural conditions such as day and night, season, geographic latitude and altitude, etc. In addition to the influence of random factors such as sunny, cloudy, cloudy and rainy, the solar irradiation reaching a certain ground is neither continuous nor stable, thiswhich makes the development and large-scale use of solar energy more difficult.
In the same place, on the same day, the intensity of solar radiation at sunrise and sunset is much less than around noon and in the same place, in different seasons, the intensity of radiation solar in summer is much less; higher in winter. The main reason is that due to the different altitude angles of the sun, the angles of incidence relative to the same horizontal plane are naturally different. The greater the angle of solar altitude, or the smaller the angle of incidence of solar radiation, the more solar energy is received in the same horizontal plane on the ground, conversely, the greater the angle of solar radiation. solar altitude is small, or the larger the angle of incidence of solar radiation, the larger the angle of solar altitude, or the smaller the angle of incidence of solar radiation, the more solar energy is received in the same horizontal plane at the soL. the more solar energy is received in the same horizontal plane on the ground, the less solar energy is received. Everyone must have had this experience when drying clothes: when the flat surface of the garment to be dried is facing the solar radiation, it dries the fastest, but when it is sideways facing the solar radiation, it dries more slowly.
In order to make solar energy a continuous and stable energy source, and thus to make it an alternative energy source that can compete with conventional energy sources, the problem of storage of energy should be well resolved, that is, solar energy radiation on clear days should be It can be stored as much as possible so that it can be used at night or on rainy days, but currently Energy storage is also one of the weakest links in solar energy use.
4? High Cost
The current die leveldevelopment of the use of solar energy is theoretically feasible and technically mature. However, some solar energy utilization devices have high cost and low efficiency. On the negative side, overall the economy cannot compete with conventional energy sources. For a long time, the development of the use of solar energy will be limited mainly by economic costs.
Advantages of solar energy
As a new energy source, solar energy has three major characteristics compared to conventional energy sources:
First: it is the most abundant source of energy available to humanity. Clean, pollution-free, environmentally friendly, inexhaustible. It is estimated that over the past 1.1 billion years, the sun has consumed 2% of its energy. In the future, it will be enough to supply humans on earth for billionss of years. It is truly inexhaustible.
Second: There is solar energy everywhere on earth, which can be developed and used locally without transportation problems, especially for greenhouses and solar rooms, solar cookers and ovens. high temperature, seawater desalination devices, water pumps. , Thermal power generation devices and solar medical equipment. Rural areas, islands and isolated areas where transportation is underdeveloped have greater use value. Areas between 50 and 60 degrees north and south latitude, where the annual sunshine duration is 1,600 to 2,400 hours (hours), are generally thought to have abundant solar energy that can be used provided that a certain price is spent initially. A sum of money is invested to make good use of solar energy. After installing the device, the energy will be lidelivered to your door continuously, free of charge, and only a small amount of equipment maintenance costs will be spent during this period.
Third: Solar energy is a clean energy source. During development and use, no waste residue, waste water, waste gas or noise will be produced and it will not affect the ecological balance.balance. Absolutely no pollution or public nuisance will be caused.
Fourth: Solar energy does not add thermal load to the Earth. This is a particularly important advantage of solar energy. This is why systems that use solar energy are also called “variable energy systems.” Because when we use solar energy to do work, even though it eventually turns into heat, if we don't use it to do work, it will eventually turn into heat.
Fifth: Security ofsolar energy. Nuclear power generation poses a risk of nuclear leakage. Once a nuclear leak occurs, it will cause a huge ecological crisis. However, solar energy absolutely has no such situation and is very reliable.
Advantages of solar products:
1. Unlimited energy is widely available and energy is provided at the lowest cost. As long as there is sunshine, it can perform photothermal conversion and work all year round.
2. Green and environmentally friendly products. As a clean, renewable energy source, solar energy has unrivaled advantages over other energy sources: no environmental pollution and no safety risks.
3. Long life expectancy. For example, the vacuum tube, the main component of the solar water heater, has a lifespan of around fifteen years. After expiration and replacement, other components may cocontinue to be used. for another cycle.
4. When used in conjunction with other energy sources, it can operate in all weathers.
5. Significant economic benefits. One-time investment and long-term benefits are the distinctive features of solar products.
Summary - The use of solar energy is imperative
In view of the advantages and disadvantages of the use of solar energy, the development of solar energy remains very desirable. Visual pollution is very subjective, and who can guarantee that a huge collector will not become a spectacular landscape, and the question of cost cannot be short-sighted. Money and space spent can be exchanged over time. Think about it: in a few years, all non-renewable energy will be exhausted. At that time, solar energy will be extremely valuable. As for the problem of poor stability, it's a fthat no one can change. see God The relationship between man and nature is not like that. The birth and death of all things have their own reasons. This is something humans cannot change. Therefore, the use of solar energy is imperative.
Technical fields of solar energy utilization
Human beings use solar energy in only three major technical fields, namely photothermal conversion, photovoltaic conversion and photochemical conversion. Additionally, there is energy storage technology. .
Photochemical conversion of sunlight includes: photosynthesis, photoelectrochemistry, photosensitive chemistry and photodecomposition reaction. Currently, this technical field is still at the experimental research stage.
Solar photoelectric conversion mainly includes various types of solar panels and power systemselectrical ation.
A solar cell is a device that directly converts sunlight into electrical energy.
The photoelectric efficiency of solar cells is about 10-14%, and their product types mainly include monocrystalline silicon, polycrystalline silicon and amorphous silicon. The price of domestic products (referring to the total cost of photovoltaic devices) is about 60-80% yuan/peak watt.
Solar cells have a wide range of applications. For example, artificial satellites, unmanned weather stations, communication stations, television relay stations, solar clocks, electric fence posts, black light lamps, navigation light, railway signal light.
Sunlight thermal conversion technology has the largest number of products. Such as water heaters, water boilers,dryers, heating and cooling, greenhouses and solar rooms, solar cookers and high temperature ovens, seawater desalination devices, water pumps, thermal power generation devices and solar medical equipment.